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Door ajar switch problem more then likely or wiring issue . The BCM - body control module won't turn off interior light , let door lock because it think's the door is open . The door ajar switch is a input to the BCM .

The first thing would be to have it checked for DTC'S - diagnostic trouble codes . Also check with an enhanced scan tool to see if the BCM shows ajar switch data (open or closed ? Do you know about body electronics ?
Body Control Module
The various BCM input and output circuits are described in the corresponding functional areas indicated on the BCM electrical schematics. The Body Control Module functions include the following:
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A/C compressor request. Refer to Air Temperature Description and Operation

Replace your oil pressure sender and see if the dash warning lights turn off. If after changing the oil pressure sender you still have oil pressure warning lights on, you may have to replace your oil pump in your oil pan.

traction system warning message.The right turn signal also blinks
rapidly if turned on,both dashboard turn signal lights also on come together venture 2001.This happens when it is cold raining and the automatic head lights are on and the brake pedal is depressed.

Most of the time the gauge unit in the tank goes bad but turning the key on and off won't make any difference. Near the tank there is a multi wire electrical connector, With it unplugged and the key on probing the wires to the front of the truck with a test light one of the wires will light in a slow blinking, This is the gas gauge. with the light blinking the gauge should read something. un plugged should read empty and cross the light to ground it should read full. If the light doesnt come on your on the way back to the dash the wire could be in troble anywhere. repairs for other things are ussally the cause. If the test light check worked then the sending unit in the tank is bad and it will need to be replaced. Repairing them doesn't seem to stay fixed. A gas theif may have run into it with a hose and they can't take much banging around. The fuel gage and fuses are next. The temperture gauge works on the same power if it works OK the power is good. Then its the gage or the wire the is a voltage limiter card in a slot next to the gage in the cluster . The dealer can order a new one when you call them with the VIN and tell them you want the fuel gauge limiter module. If you have the skills to remove the cluster and see the module 1 in. X 2 in. flat electrical card. It has a part # on it and the dealer can verify that your looking at the right part. the gages seldom fail unless their submerised in water. Har driving can sometines loosen the connections to the cluster and redoing them and turning it on again, may correct thr problem. do this with the card and the gage too before you but anything, check the wire from the gage module maks it all the way to the gas tank with a jumper wire and a test light as the wire being broken somethere is most common.

probably just a warning system in the car to get your attention many cars that have an alternator or battery thats going bad the temp gauge will jump up to hot soon as the problem is fixed everything returns to mormal